R1:dfe47157d322

When picking a default menu item to render, don't pick disabled items

Summary:
Depends on D20358. Fixes T12871. After refactoring, we can now tell when a "storage" menu item generated only disabled "display" menu items, and not pick any of them as the default rendering.

This means that if you're looking at a portal/menu with several dashboards, but can't see some at the top, you'll get the first one you can see.

Also clean up a lot of minor issues with less-common states.

Test Plan:
- Created a…